Max-Planck-Institut für Kernphysik Heidelberg

Structure and dynamics of few electron ions in an EBIT

Priv.-Doz. Dr. José Ramon Crespo López-Urrutia

  Research topics:  |  Ions in Traps  |  Electrons in Collisions  |  Lasers in Time  |  
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The Heidelberg cryogenic EBIT is one of the three high-energy EBITs in operation worldwide which can produce and store ions having charge states as high as Hg78+. Different spectroscopic techniques from the x-ray to the visible range, as well as laser spectroscopy, are applied at the Heidelberg EBIT to the study of HCIs. Ions extracted from the trap are also used to investigate collisions processes of highly charged ions with electrons, atoms and molecules.



The FLASH-EBIT is a cryogenic EBIT specifically designed and built at the MPIK to be transportable. It is mainly designated for experiments at facilities providing sources of intense ultraviolet and x-ray radiation, like synchrotrons (BESSY, DESY) or free electron lasers (FLASH, LCLS, XFEL). In addition it is used for a wide range of other experiments in Heidelberg.



We built a new EBIT which will utilize an up to 10 times higher electron beam current compared to the HD- and FLASH-EBITs. This will allow for faster charge breeding and the production of heavy highly charged ions.


A cryogenic Paul Trap for highly charged ions (CryPTEx)

An electron beam ion trap (EBIT) is an effective tool for spectroscopy of highly charged ions (HCIs). However, the deep trapping potential leads to high temperatures of the stored ions, and limits spectral resolution resolution. A new linear cryogenic Paul-Trap experiment (CryPTEx) inline with an EBIT will provide long storage times for HCIs due to the extremely low background pressure in a 4K enclosure. The device will use sympathetic cooling of the trapped HCIs with laser-cooled singly charged ions to resolve the natural line width of forbidden transitions. In addition, addressing individual ions should eventually become possible, since these arrange themselves in stable Coulomb crystals.


A XUV frequency comb for high precision spectroscopy of highly charged ions

To study optical transitions of highly charged ions in the extreme ultraviolet (XUV) with high precision, a coherent ultra-narrow light source in this spectral region is required. For these reasons, we are developing an XUV frequency comb. High-harmonic generation (HHG) is used to transfer the coherence and stability of a near infrared frequency comb to the XUV.

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